TC1796
Peripheral Units (Vol. 2 of 2)
Analog-to-Digital Converter (ADC)
User’s Manual 25-11 V2.0, 2007-07
ADC, V2.0
In the example of Figure 25-6, the conversion request source “Auto Scan” has triggered
conversion request(s) that are not served according to a currently running conversion
and the locked arbitration. On timer = 0, the conversion requested by the timer is started
(it is assumed that the “Timer” is programmed to a higher priority than the “Auto Scan”).
Arbitration Lock Mode is enabled by setting bit field TCON.ALB to any value greater than
zero.
The value of the arbitration lock boundary is also used to specify the time t
LOCK
for which
the arbitration is locked. Running in Arbitration Lock Mode, the current value of the timer
register is compared to the arbitration lock boundary. Note that the arbitration will always
be locked if the reload value is selected to be equal to or less than the arbitration lock
boundary. On a compare match, the arbitration logic is locked (STAT.AL = 1), while
timer = 0 removes the arbitration lock. Bit STAT.AL is either cleared if timer = 0 or after
clearing bit TCON.TR.
25.1.2.4 Parallel Conversion Request Source “External Event”
Externally triggered conversion requests are mandatory for various control applications.
The conversion request source “External Event” receives the trigger line ETR from the
external world via the interrupt input unit. Figure 25-7 shows the structure of the
conversion request source “External Event”.
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